Mandarin Fish Siniperca Scherzeri Research Articles

반순환여과시스템내에서 먹이종류가 1년생 쏘가리(Siniperca scherzeri)의 성장, 사료이용 및 체조성에 미치는 영향

This study compared the effects of diets consisting of moist pellet (MP), frozen food (FF) and live food (LF) on the growth, feed utilization and whole body composition on the mandarin fish Siniperca scherzeri. Three replicated groups of 45 fish each (initial mean weight 106 g) were fed one of three experimental diets for 12 weeks. At the end of the feeding trial, weight gain and specific growth rate of fish fed the FF and LF diets were higher than those of fish fed the MP (P0.05). Feed efficiency of fish fed the FF and LF were higher than those of fish fed the MF (P0.05). Proximate composition of fish were not affected by diets (P0.05). Plasma chemical composition of fish were not affected by diets (P0.05). This suggests that frozen food (FF) can be suitable to feed growing mandarin fish.

Feeding ratio affects growth, body composition, and blood chemistry of mandarin fish (Siniperca scherzeri) in recirculating aquaculture system

The effects of various feeding ratios on the growth, body composition, and blood chemistry of the juvenile mandarin fish Siniperca scherzeri (initial body weight 9.6 g) were examined in recirculating freshwater system equipped with 21, 300 L tanks at 20 fish per tank. The triplicate groups of seven feeding ratios treatments were prepared: 100% (control), 95%, 90%, 85%, 80%, 75%, and 70% of satiation. The feed amount of control group was determined by supplying with apparent satiation and then the feed amounts of the other six feeding groups were determined based on the feed amount of the control group. Fish were hand-fed with test diet (55.4% crude protein) for 10 weeks. Weight gain (WG) and specific growth rate of fish fed to 100% satiation were not significantly (p > 0.05) different from those of fish fed to ≥ 80% satiation but were significantly higher than those of fish fed to 75% and 70% satiation. Feed efficiency, protein efficiency ratio, and protein retention of 100% satiation were not significantly different from those of 95% and 90% satiation but were significantly (p <0.05) lower than ≤ 85% satiation. Condition factor, hepatosomatic index, and coefficient variation were not significantly (p > 0.05) affected by feeding ratio. Whole body composition and contents of hematocrit, glutamic oxaloacetic transaminase, glutamic pyruvic transaminase, glucose, total protein, and high-density lipoprotein cholesterol in blood serum were not significantly (p > 0.05) affected by the feeding ratio; however, content of total cholesterol tended to decrease as the feeding ratio decreased. Using broken-line analysis of WG, it was suggested that the optimum feeding ratio of juvenile mandarin fish, ranging from 9.0 g to 37.0 g, appeared to be 87.7% of satiation without growth inhibition.

쏘가리(Siniperca scherzeri) 치어 사료 내 어분대체원으로써 동애등에(Hermetia illucens)의 이용성

A feeding trial was carried out to assess the effect of partially replacing fish meal by black soldier fly meal (BSFM) in diets for mandarin fish Siniperca scherzeri. Seven experimental groups were fed with a FM(fish meal)-based diet without BSFM (BSFM0), six diets with 5% (BSFM5), 10% (BSFM10), 15% (BSFM15), 20% (BSFM20), 25% (BSFM25) and 30% (BSFM30) of FM substitution with BSFM. Triplicate groups of fish (average weight of 6.9 g) were fed one of the seven experimental diets twice daily for 8 weeks. At the end of the feeding trial, weight gain and specific growth rate of fish fed the BSFM 30 diets were lower than those of fish fed the other diets. Feed efficiency of fish fed the BSFM0, BSFM5, BSFM10, BSFM15 and BSFM25 were higher than those of fish fed the BSFM30 diets, was not affected by BSFM20 diets. Plasma total cholesterol contents were significantly reduced in fish fed the diet with the highest BSFM level(BSFM30). These results indicate that BSFM has potential as alternative to FM in practical diets for juvenile mandarin fish and can be used substitute for fish meal up to 25% in diet.

A natural infection by the red sea bream iridovirus-type Megalocytivirus in the golden mandarin fish Siniperca scherzeri.

An outbreak of a Megalocytivirus infection was found in the golden mandarin fish Siniperca scherzeri during September and October 2016, in Korea. Phylogeny and genetic diversity based on the major capsid protein (MCP) and adenosine triphosphatase (ATPase) genes showed a new strain. Designated as GMIV, this strain derived from the golden mandarin fish was suggested to belong to the red sea bream iridovirus (RSIV)-subgroup I. Additionally, this train clustered with the ehime-1 strain from red sea bream Pagrus major in Japan and was distinguished from circulating isolates (RSIV-type subgroup II and turbot reddish body iridovirus [TRBIV] type) in Korea. The infection level, evaluated by qPCR, ranged from 8.18×102 to 7.95×106 copies/mg of tissue individually, suggesting that the infected fish were in the disease-transmitting stage. The diseased fish showed degenerative changes associated with cytomegaly in the spleen as general sign of Megalocytivirus infection. The results confirm that the RSIV-type Megalocytivirus might have crossed the environmental and species barriers to cause widespread infection in freshwater fish.

Effect of Stocking Density on the Growth and Body Composition of the Mandarin Fish Siniperca scherzeri

This study investigated the effects of stocking density on the growth of the mandarin fish Siniperca scherzeri, in small (1-year old, 50.2 g/fish) and large (2-years old, 173.1 g/fish) size (age) groups. Small and large fish groups were fed pelleted diets twice daily for 10 and 15 weeks, respectivel...

Growth and Body Composition of Mandarin Fish Siniperca scherzeri Reared at High Water Temperatures

Growth and Body Composition of Mandarin Fish Siniperca scherzeri Reared at High Water Temperatures

쏘가리(Siniperca scherzeri)의 시기에 따른 영양성분 변화

Seasonal variation in the composition and fatty acid, amino acid, cholesterol, and vitamin contents in the muscles of the mandarin fish Siniperca scherzeri, caught in Soyangho Lake, Korea, was studied. The moisture content was 74.5-78.7 g/100 g, lipids ranged between 1.06 and 4.23 g/100 g, protein between 18.5-20.7 g/100 g, and ash between 0.74 and 2.04 g/100 g. The moisture content was lowest in May and tended to increase from June to October. The highest protein levels occurred in May, which coincided with the timing of oocyte maturation, and then decreased at the beginning of spawning. The highest lipid levels occurred in May and November coinciding with the periods before spawning and hibernation. The ratio of EAA/NEAA was higher than the value recommended by FAO for an 'ideal' food protein. There were significant differences in Mg and Fe contents with spawning; they were highest in May. Contents of vitamin A and E were from not detected (ND) to <TEX>$17.1{\mu}g/100g$</TEX> and ND to 0.69 mg/100 g, respectively and were highest in November. The content of niacin tended to decrease in June and increased until November and hibernation. The cholesterol content was 14.9-78.9 mg/100 g; it decreased from March to July and then increased until November. In conclusion, there is potential for expanding the commercial utilization of the mandarin fish as a food resource.

사육 수온에 따른 쏘가리(Siniperca scherzeri) 치어의 성장 및 체조성 변화

This study was conducted to investigate the effects of different water temperatures on growth, survival, biochemical composition, and blood physiological parameters of juvenile mandarin fish Siniperca scherzeri. Feed-trained juvenile fish were subjected to four water temperatures (20, 23, 26 and 29&...

Development and characterization of novel polymorphic microsatellite loci in Siniperca scherzeri Steindachner and Siniperca chuatsi (Basilewsky)

De novo assemblies of transcriptome sequence of F(1) interspecies hybrids between Mandarin fish Siniperca chuatsi (Basilewsky) (♀) and Golden mandarin fish Siniperca scherzeri Steindachner (♂) were generated using Illumina sequencing. In the present study, 64 microsatellite primer pairs were designed on basis of the transcriptome data. Those primer pairs were then characterized both in S. scherzeri and S. chuatsi. Thirty-eight polymorphic loci were detected in 37 individuals from a wild S. scherzeri population with 2-10 alleles per locus. The values for observed and expected heterozygosities ranged from 0.0000 to 0.8378 and from 0.4235 to 0.8771, respectively. Meanwhile, 36 microsatellite loci were polymorphic in 30 individuals from a wild S. chuatsi population with 2-8 alleles per locus. High cross-species transferability was detected. These markers will facilitate further studies on the conservation genetics, population structure and construction of high-density linkage map. What's more, they will be useful for parental selections in controlled hybridization breeding programs.

Effects of the timing of initial feeding on growth and survival of spotted mandarin fish Siniperca scherzeri larvae

The effects of delayed first feeding on growth and survival of spotted mandarin fish Siniperca scherzeri larvae were examined under controlled conditions. Morphometric characters [yolk-sac volume, oil globule volume, head depth (H(D)), body depth (B(D)), eye diameter (E(D)), musculature height (M(H)), mouth diameter (M(D)) and total length (L(T))], body mass (M), specific growth rate (S(GR)) and survival were evaluated under different first-feeding time (2, 3, 4 and 5 days after hatching). Larvae began to feed exogenously at 2 days after hatching (DAH) and the point of no return (P(NR)) occurred between 5 and 6 DAH at 23 degrees C, range +/-1.0 degrees C. The yolk volume of larvae first-fed at 2 days had a significant difference compared with that of larvae first-fed at 3, 4 and 5 days on 3 and 4 DAH. The larvae first-fed at 2 days achieved comparatively better growth performance than that of 3, 4 and 5 days. On 5 DAH, all morphometric characters had significant differences between 2 and 5 days and 2 and 4 days initial feeding, respectively. Total mortality was recorded on 9 DAH for the larvae first-fed at 5 days. On 12 DAH, significant differences were observed between 2 and 4 days and 3 and 4 days initial feeding for all morphometric characters. From 16 DAH to the end of experiment, all growth variables of the larvae first-fed at 2 days were significantly higher than those in other treatments. The S(GR) (2-9 DAH) first-fed at 2 and 3 days were significantly higher than 4 and 5 day treatments, and the S(GR) (9-16 DAH) first-fed at 2 days was significantly higher than 3 and 4 day treatments. There was no significant difference, however, of S(GR) (16-28 DAH) among treatments. Survival rate was significantly higher at 2 days initial feeding (27.42%) when compared with 3 (15.96%) and 4 days (7.92%) initial feeding at the end of experiment. The present study suggests that the first feeding of S. scherzeri larvae should be initiated at 2 days after hatching for achieving good growth and survival.